Sunfree Lighting Limited is a high-tech manufacturer specialized in R&D and production of solar led street light

The Technical Points of Leds

by:SUNFREE     2020-06-21
'Ten City, ten thousand' is the application of high-tech industries encourage development of the demonstration project, which aims to get a number of well-established by the city, national, local, co-invested enterprise model, pioneered use of municipal lighting led pilot, approach to to comprehensively promote China's semiconductor lighting to seek experience and enhance and that is a through software of independent innovation, and enhance international competitiveness, and promote China's semiconductor lighting industry bigger and stronger. This demonstration project is selected more lights, tunnel lights and drive a greater impact on product supply three associated with its technical progress, given that 'city of ten thousand ten,' the smooth implementation for this reference. Currently, traditional light sources for road lighting questionable sodium lamp is mainly, LED lights on thus, they can roads in the number of supporting applications for a pilot, but both have shown significant differences between benefits and drawbacks. In terms of light efficiency, underhand sodium lamps up to 140 lm / W, than the present commercial high-power LED light efficiency 100 lm / W high, but the LED's color-rendering index (about 80) is much more than high pressure sodium (about 25) , and underneath the same illumination, white LED drivers or pedestrians more useful to find the target, the road lighting effects and comfort is greater than the high-pressure sodium lamps. In the light efficiency, high pressure sodium light by spherical design, because of the reflector efficiency, high pressure sodium lamps efficiency frequently only 70%. But the LED is directed out of light, because the involving appropriate optical design, wind up hurting the light directly projected onto the pavement, lighting efficiency could be up to 85% much more. Therefore, light efficiency and luminaire efficiency only from the point of view, we can see LED lamps to replace the traditional street light the great potential. Therefore, this article from the research Center of Sun Yat-sen semiconductor lighting system in the development of LED lighting applications in the process of distribution of light, power and cooling technology in three key research achievements to objectives the 'Ten City, ten thousand,' Demonstration Application Engineering close 'LED lights' in the technology roadmap and technical support. Light distribution Obtained by optical design intensity distribution of the bat wing LED lights on this market today, the sunshine source is split in two ways: 1 W high-power single white LED light source arrays and high-power integrated module surprise. Although the LED lights in the national standards had not yet introduced, but the LED lights with light in the reference standard of conventional road lighting lighting requirements to achieve the following objectives: appropriate average surface brightness; high total illumination uniformity and vertical illumination uniformity; appropriate environment than; glare control. Distribution curve from the purpose of view, these objectives to be accomplished mainly the suitable optical design to obtain the intensity distribution on the bat wing to onboard the road rectangular spot distribution. But ordinary high-power white light LED package lens (ie one optical lens) is not suitable for direct application LED lights, so every high-power white LED in optical lens optical lens on having to add the second, the current 'peanuts' The second type of optical lens can achieve good results. Semiconductor Research Center, Sun Yat-sen lighting system design concept is developed a new separate second optical lens, but packaged in a light-emitting LED light source for direct wave-shaped optical lens mask design, utilize of masks to obtain the LED lens light source lamp The second optical lens functions. With the industrial packaging industry needs to transport closer towards the downstream application, Research Center of Sun Yat-sen semiconductor lighting system has also developed a romantic shape successful optical lens, the LED chip package when installed directly, with small, low cost, full compliance with LED lights and road lighting requirements With the advances in packaging technology, the white LED in the packages with the single high-power LED 1W high power devices integrated package to gradually shift the light module. Today's high-power source of light module integrated package as high as 100W perhaps more power, but such light emitting area as large as the optical light distribution design difficult. Semiconductor Research Center, Sun Yat-sen lighting systems boost development of high-power white LED red light intelligent control system technology, you're able to get more than 90 color-rendering index, correlated color temperature of 2500 ~ 8000K adjustable source of light module (Figure 2). Pc or google tv used within packaging substrate integrated photoelectric conversion chips, real-time monitoring of the white color light source module parameters, photoelectric conversion chip to detect parameters of the white color changes back to the intelligent control system, lighting system through the calculation to guarantee can output the optimal properties belonging to the white color, light source modules can guarantee to keep set output range of correlated color temperature and color rendering index; package substrate temperature sensor is integrated around chip package substrate to detect the temperature live to reach the large Power LED chip junction temperature, indirect monitoring system when the junction temperature exceeds the preset temperature, the system can automatically adjust the cooling channels or cooling system reduces the power LED. Light source module can be single 1 W high power white LED array, or in high-power source of light module integrated package be composed, has been utilized in Leds on.
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